METHOD FOR ASSEMBLING SWITCHING MEANS FOR RESERVOIR

PROBLEM TO BE SOLVED: To more easily assemble a switching means with a reservoir body by softening an outer circumferential part of an opening of a recessed part, pressing the outer circumferential part with a punching member to be expanded toward the opening of the recessed part. SOLUTION: When the switching means inserting process in which a switch 5 is inserted into a recessed part 11ca is achieved, a forward end part of a supporter 153 abuts on a stepped part, and an opening of the recessed part 11ca is closed. A punching member 20 is heated, and the punching member 20 is pressed against an outer circumferential part 11ca surrounding the opening of the recessed part 11ca. An outer circumferential part 11cb is softened through the heat treatment by the punching member 20, and the outer circumferential part 11cb is pressed by the punching member 20. By pressing the outer circumferential part 11cb in the direction of the arrow by the punching member 20, the heat-deformed outer circumferential part 11cb is squeezed, and expanded toward the opening side of the recessed part 11ca, i.e., toward the center of an exposed surface of a supporter 15 to form an expanded part.